Nexperia USA Inc. BAS40,215

Overview

BAS40,215 from Nexperia is a general-purpose Schottky diode in SOT23 package, designed for ultra-high-speed switching and voltage clamping. It delivers 40 V reverse voltage rating, 120 mA forward current capability, 380 mV forward voltage at 1 mA (pulsed), 5 pF capacitance at 0 V, and AEC-Q101 qualification for automotive use.

For engineers reviewing the BAS40,215 datasheet, BAS40,215 pinout, BAS40,215 application, or BAS40,215 equivalent, key selection criteria include low VF for efficiency-critical bias networks, low Cd for RF/switching node integrity, n.c. terminal isolation in compact layouts, and thermal resistance (500 K/W) for ambient-limited SMT designs.

Technical Context

The BAS40,215 implements a planar Schottky barrier structure optimized for fast recovery (no minority-carrier storage), enabling sub-nanosecond switching in clamping and signal routing applications. Its 1 µA IR at 30 V and 10 µA at 40 V supports stable DC biasing under moderate reverse stress.

Thermal design relies on its 150 °C maximum junction temperature and FR4-mount R_th(j-a) of 500 K/W - a constraint requiring careful copper area allocation in high-duty-cycle pulsed operation. The n.c. (pin 2) eliminates parasitic coupling paths in high-frequency layout.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-terminal surface-mount plastic package, 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Compared with NSR0230HT1G and SD103ATW-7-F, the BAS40,215 uniquely balances 40 V blocking, ultra-low 380 mV VF at low current, and SOT23 size - making it optimal for high-density automotive signal conditioning where both voltage margin and signal fidelity matter.

Availability

BAS40,215 is available at Aetrix Electronics and suitable for automotive signal clamping, high-speed logic-level translation, and RF detector input protection requiring stable component supply and AEC-Q101 compliance.

Supply support for BAS40,215 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert specializing in high-performance, reliable discrete, logic, and MOSFET devices, with roots in Philips and headquartered in Nijmegen, Netherlands.

The BAS40,215 belongs to Nexperia's general-purpose Schottky diode product line, engineered for robustness in automotive and industrial signal-path applications where speed, leakage, and small form factor are critical.

FAQ

Is the BAS40,215 pin 2 truly unconnected, and can it be grounded?

Yes, pin 2 is internally not connected per Nexperia's official pinning diagram and package outline. Grounding it is permissible only for mechanical anchoring or thermal relief - it must never be used as a signal or return path, as no internal bond wire or die connection exists. Doing so introduces no electrical risk but adds no functional benefit.

How does the 500 K/W thermal resistance affect real-world power dissipation?

At 25 °C ambient and 120 mA forward current with 380 mV VF, power dissipation is 45.6 mW. With R_th(j-a) = 500 K/W, junction temperature rise is ~22.8 °C - resulting in T_j ≈ 48 °C, well below the 150 °C limit. However, in enclosed automotive enclosures exceeding 85 °C ambient, derating to ≤60 mA is recommended to maintain safety margin.

Can the BAS40,215 replace the BAT54 series in existing designs?

Yes, with verification: both share SOT23-3 packaging and anode/cathode/n.c. pinout, and BAS40,215 matches BAT54's 30 V VR and 200 mA IFSM. However, BAS40,215 has higher VR (40 V vs. 30 V) and lower VF (380 mV vs. ~420 mV), offering improved surge margin and efficiency - confirm layout clearance for the slightly different die pad dimensions per Nexperia's SOT23 outline.

What does AEC-Q101 qualification specifically cover for the BAS40,215?

AEC-Q101 qualification for the BAS40,215 includes temperature cycling (−40 °C to +125 °C, 1000 cycles), high-temperature reverse bias (1000 hrs at 125 °C, 40 V), and ESD testing (HBM ≥2 kV). It certifies suitability for automotive under-hood and cabin applications but excludes life-support or safety-critical functions unless separately validated by the end customer.